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Leases (Supplemental Information Relating to Operating Leases) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Leases [Abstract]      
Lease expense incurred: Operating lease cost $ 7,890 $ 5,187  
Operating lease right of use assets 156,626 69,869 $ 161,435
Operating lease liabilities 167,072 77,270 $ 169,909
Operating cash flows from operating leases $ (4,919) $ (4,431)  
Weighted average remaining operating lease term 12 years 4 months 24 days   12 years 7 months 6 days
Weighted average discount rate on operating leases 3.87%   3.91%